/* =============================================================================
 * M01_MasterData_UI_Test_B.ts
 * 로직 사용성 테스트 컨테이너 — 방식 B: 호표 + 옆 설명 카드 (PLAN.md 1-2)
 *
 * 접속 계약: export function render(host, logicKey) 하나.
 * 읽기 + 시험 계산만 — 저장 없음 · 정본 로직 안 고침. 로직 읽기·시험 계산은 지금
 * 로직 화면이 쓰는 Store·API(fetchLogic · runCalc · elements · table)를 그대로
 * 씀 — 새 엔진·새 계산 없음(만약·찾기 식 자체는 서버가 풂 · 여기선 찾기(...) 가
 * 가리키는 원문 표를 다시 읽어 「걸린 줄」만 강조).
 *
 * 줄을 누르면 옆 카드 — 원문 표 미리보기(걸린 줄 강조) · 적용된 할증 · 쉬운 말
 * 풀이(식을 문장으로, 안 되면 원문 식 그대로) · 출처. 입력을 바꾸면 호표와
 * 카드가 같이 바뀜(자동 계산 — [계산] 버튼 없음).
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { createSelectField, el } from "@ui/ui_template_elements";
import {
  fetchLogic,
  runCalc,
  type CalcAnswer,
  type CalcLine,
  type ElementBrief,
  type HoLine,
  type LogicOne,
  type NamedFormula,
} from "./M01_MasterData_UI_Logic_Api";
import { formatNumber } from "./M01_MasterData_UI_Logic_Edit";
import { hasPickable, pickPanel, swappedRow, type Swaps } from "./M01_MasterData_UI_Test_Pick";
import { tt } from "./M01_MasterData_UI_Test_Text";

/* ── 원문 표(소요량·계수) 미리보기 — /elements 로 파일을 찾고 /table 로 통째 읽음 ── */

interface TableRow {
  file: string;
  키: string;
  이름?: string;
  원문번호?: string;
  출처?: string;
  용도?: { 공종?: string; 대상?: string[]; 로직키?: string[] };
  조건?: Record<string, string>;
  값칸?: Record<string, string>;
  줄?: Record<string, unknown>[];
}

const tableCache = new Map<string, Promise<TableRow | null>>();

async function getJson<T>(path: string): Promise<T | null> {
  try {
    const res = await fetch(`${API_BASE_URL}/m01${path}`);
    if (!res.ok) return null;
    return (await res.json()) as T;
  } catch {
    return null;
  }
}

function loadTable(key: string): Promise<TableRow | null> {
  const cached = tableCache.get(key);
  if (cached) return cached;
  const job = (async (): Promise<TableRow | null> => {
    for (const group of ["소요량", "계수"]) {
      const found = await getJson<{ items: ElementBrief[] }>(
        `/elements?group=${encodeURIComponent(group)}&q=${encodeURIComponent(key)}&limit=5`,
      );
      const file = found?.items?.find((i) => i.ref === key)?.file;
      if (!file) continue;
      const got = await getJson<{ table: TableRow }>(
        `/table?file=${encodeURIComponent(file)}&key=${encodeURIComponent(key)}`,
      );
      if (got?.table) return { ...got.table, file };
    }
    return null;
  })();
  tableCache.set(key, job);
  return job;
}

/* ── 식 속 찾기(표, 조건...).칸 뽑기 ────────────────────────────────────── */

interface FindCall {
  table: string;
  conds: [string, string][];
  col: string;
}

const FIND_RE = /찾기\(\s*([A-Za-z0-9_]+)\s*,([^)]*)\)\s*\.\s*([A-Za-z0-9_가-힣]+)/g;

function splitConds(raw: string): [string, string][] {
  return raw
    .split(",")
    .map((p) => p.trim())
    .filter(Boolean)
    .map((p): [string, string] => {
      const i = p.indexOf("=");
      return i < 0 ? [p, p] : [p.slice(0, i).trim(), p.slice(i + 1).trim()];
    });
}

function findCalls(expr: string): FindCall[] {
  const out: FindCall[] = [];
  for (const m of expr.matchAll(FIND_RE)) {
    out.push({ table: m[1], conds: splitConds(m[2]), col: m[3] });
  }
  return out;
}

/** 식 안에 이름이 낱말로 나오는지 — 한글엔 \b 가 안 먹어 앞뒤 글자를 직접 봄 */
function mentions(expr: string, name: string): boolean {
  if (!name) return false;
  const idx = expr.indexOf(name);
  if (idx < 0) return false;
  const isWord = (c: string | undefined) => !!c && /[A-Za-z0-9_가-힣]/.test(c);
  return !isWord(expr[idx - 1]) && !isWord(expr[idx + name.length]);
}

interface RelatedFind {
  source: string; // "이 줄" 또는 물려 쓰는 중간 이름
  find: FindCall;
}

/** 이 줄 식이 기대는 찾기(...) — 자기 식 + (한 단계) 물려 쓰는 중간 식 */
function relatedFinds(expr: string, middles: NamedFormula[]): RelatedFind[] {
  const out: RelatedFind[] = findCalls(expr).map((find) => ({ source: "이 줄", find }));
  for (const m of middles) {
    if (!mentions(expr, m.이름)) continue;
    for (const find of findCalls(m.식)) out.push({ source: m.이름, find });
  }
  return out;
}

/* ── 조건 값 풀기 · 표 줄 맞히기 ───────────────────────────────────────── */

interface EvalCtx {
  values: Record<string, string>;
  middle: Record<string, unknown>;
}

function resolveIdent(name: string, ctx: EvalCtx): string | number | undefined {
  const quoted = name.match(/^["'](.*)["']$/);
  if (quoted) return quoted[1];
  if (/^-?\d+(\.\d+)?$/.test(name)) return Number(name);
  if (ctx.values[name] !== undefined && ctx.values[name] !== "") return ctx.values[name];
  if (ctx.middle[name] !== undefined) return ctx.middle[name] as number;
  return undefined;
}

function sameValue(a: unknown, b: unknown): boolean {
  if (a === undefined || a === null || b === undefined) return false;
  const na = Number(a);
  const nb = Number(b);
  if (!Number.isNaN(na) && !Number.isNaN(nb)) return na === nb;
  return String(a) === String(b);
}

/** 지금 조건 값으로 찾기() 가 고를 줄 — 못 맞히면 null(값을 아직 안 골랐거나 후보 여럿) */
function matchRow(
  table: TableRow,
  conds: [string, string][],
  ctx: EvalCtx,
): Record<string, unknown> | null {
  for (const row of table.줄 ?? []) {
    if (conds.every(([col, rhs]) => sameValue(row[col], resolveIdent(rhs, ctx)))) return row;
  }
  return null;
}

/* ── 쉬운 말 풀이 — 찾기()/만약() 을 문장으로, 안 되면 식 그대로 ─────────── */

function splitTop(s: string): string[] {
  const out: string[] = [];
  let depth = 0;
  let cur = "";
  for (const ch of s) {
    if (ch === "(") depth++;
    if (ch === ")") depth--;
    if (ch === "," && depth === 0) {
      out.push(cur);
      cur = "";
    } else cur += ch;
  }
  out.push(cur);
  return out;
}

function expandIf(expr: string): string {
  const at = expr.indexOf("만약(");
  if (at < 0) return expr;
  let depth = 0;
  let j = at + 2; // "만약(" 의 '(' 자리
  for (; j < expr.length; j++) {
    if (expr[j] === "(") depth++;
    else if (expr[j] === ")") {
      depth--;
      if (depth === 0) {
        j++;
        break;
      }
    }
  }
  const [cond, then, els] = splitTop(expr.slice(at + 3, j - 1)).map((p) => p.trim());
  const said = `(${expandIf(cond)} 이면 ${expandIf(then)}, 아니면 ${expandIf(els ?? "")})`;
  return expandIf(expr.slice(0, at) + said + expr.slice(j));
}

function explain(expr: string): string {
  const withFind = expr.replace(FIND_RE, (_all, table: string, conds: string, col: string) => {
    const cs = splitConds(conds)
      .map(([, rhs]) => rhs)
      .join(" · ");
    return `[${table} 표에서 ${cs} 에 맞는 「${col}」]`;
  });
  return expandIf(withFind).trim() || expr;
}

/* ── 화면 상태 ────────────────────────────────────────────────────────── */

interface State {
  one: LogicOne;
  values: Record<string, string>;
  answer: CalcAnswer | null;
  selected: number;
  calcSeq: number;
  swaps: Swaps;
  picker: HTMLElement;
}

export function render(host: HTMLElement, logicKey: string): void {
  host.replaceChildren(el("p", { className: "m01-logic__muted", text: "불러오는 중…" }));
  void fetchLogic(logicKey)
    .then((one) => {
      const swaps: Swaps = new Map();
      const state: State = {
        one,
        values: {},
        answer: null,
        selected: 0,
        calcSeq: 0,
        swaps,
        picker: pickPanel(one, swaps, () => void recalc(host, state)),
      };
      paint(host, state);
      void recalc(host, state);
    })
    .catch((error) => {
      host.replaceChildren(
        el("p", { className: "m01-logic__reasons", text: String(error?.message ?? error) }),
      );
    });
}

async function recalc(host: HTMLElement, state: State): Promise<void> {
  const seq = ++state.calcSeq;
  const inputs: Record<string, unknown> = {};
  for (const spec of state.one.logic.입력 ?? []) {
    const raw = (state.values[spec.이름] ?? "").trim();
    if (raw === "") continue;
    const option = spec.고르기?.find((o) => String(o) === raw);
    inputs[spec.이름] =
      option !== undefined ? option : Number.isNaN(Number(raw)) ? raw : Number(raw);
  }
  try {
    const answer = await runCalc({
      key: state.one.logic.키,
      inputs,
      row: swappedRow(state.one.logic, state.swaps) ?? state.one.logic,
      file: state.one.file,
    });
    if (seq !== state.calcSeq) return; // 최신 응답만 채택
    state.answer = answer;
  } catch (error) {
    if (seq !== state.calcSeq) return;
    state.answer = { ok: false, reason: error instanceof Error ? error.message : String(error) };
  }
  paint(host, state);
}

/* ── 그리기 ───────────────────────────────────────────────────────────── */

function paint(host: HTMLElement, state: State): void {
  const row = state.one.logic;

  const inputWrap = el("div", { className: "m01-logic__fields" });
  inputWrap.style.cssText = "display:flex;flex-wrap:wrap;gap:12px;margin-bottom:12px;";
  for (const spec of row.입력 ?? []) {
    let control: HTMLElement;
    if (spec.고르기?.length) {
      const pick = createSelectField({
        options: ["", ...spec.고르기.map(String)].map((o) => ({ value: o, text: o || "(선택)" })),
        value: state.values[spec.이름] ?? "",
        compact: true,
        onChange: (v) => {
          state.values[spec.이름] = v;
          void recalc(host, state);
        },
      });
      control = pick.root;
    } else {
      const box = el("input", {
        className: "m01-logic__input",
        attrs: { type: "text", inputmode: "decimal" },
      });
      box.value = state.values[spec.이름] ?? "";
      let timer: ReturnType<typeof setTimeout> | undefined;
      box.addEventListener("input", () => {
        state.values[spec.이름] = box.value;
        clearTimeout(timer);
        timer = setTimeout(() => void recalc(host, state), 300);
      });
      control = box;
    }
    const label = spec.단위 ? `${spec.이름} (${spec.단위})` : spec.이름;
    inputWrap.append(
      el("label", {
        className: "m01-logic__field",
        children: [el("span", { text: label }), control],
      }),
    );
  }

  const main = el("div", {});
  main.style.cssText = "flex:1 1 60%;min-width:0;";
  main.append(
    el("h3", { text: `${row.원문번호} ${row.이름}` }),
    inputWrap,
    ...(hasPickable(state.one.logic)
      ? [
          el("details", {
            attrs: { open: "" },
            children: [el("summary", { text: tt("Mat_Title") }), state.picker],
          }),
        ]
      : []),
    buildHoTable(host, state),
  );
  if (state.answer && !state.answer.ok) {
    main.append(
      el("div", {
        className: "m01-logic__reasons",
        children: [el("strong", { text: "멈춤" }), el("div", { text: state.answer.reason })],
      }),
    );
  }

  const side = el("div", { className: "m01-logic__side" });
  side.style.cssText =
    "flex:1 1 36%;min-width:280px;border:1px solid var(--ui-border,#ddd);border-radius:8px;padding:12px;";
  void buildCard(side, state);

  const layout = el("div", {});
  layout.style.cssText = "display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap;";
  layout.append(main, side);
  host.replaceChildren(layout);
}

function buildHoTable(host: HTMLElement, state: State): HTMLElement {
  const lines: CalcLine[] | null = state.answer?.ok ? (state.answer.lines ?? null) : null;
  const rows = (state.one.logic.호표 ?? []).map((ho, i) => {
    const calc = lines?.[i];
    const tr = el("tr", {
      className: i === state.selected ? "m01-logic__row is-selected" : "m01-logic__row",
      children: [
        el("td", { text: ho.이름 ?? ho.요소 }),
        el("td", { text: ho.규격 ?? "" }),
        el("td", { text: calc ? `${formatNumber(calc.수량)} ${calc.단위}` : (ho.단위 ?? "") }),
        el("td", { className: "m01-logic__money", text: calc ? formatNumber(calc.금액) : "" }),
      ],
    });
    tr.style.cssText =
      "cursor:pointer;" + (i === state.selected ? "background:var(--ui-accent-bg,#eef4ff);" : "");
    tr.addEventListener("click", () => {
      state.selected = i;
      paint(host, state);
    });
    return tr;
  });
  return el("table", {
    className: "m01-logic__grid",
    children: [
      el("thead", {
        children: [
          el("tr", {
            children: ["이름", "규격", "수량", "금액"].map((h) => el("th", { text: h })),
          }),
        ],
      }),
      el("tbody", { children: rows }),
    ],
  });
}

async function buildCard(side: HTMLElement, state: State): Promise<void> {
  const ho: HoLine | undefined = (state.one.logic.호표 ?? [])[state.selected];
  if (!ho) {
    side.replaceChildren(el("p", { className: "m01-logic__muted", text: "호표 줄이 없음" }));
    return;
  }
  const lines = state.answer?.ok ? (state.answer.lines ?? []) : [];
  const calc = lines[state.selected];
  const middle = state.answer?.ok ? (state.answer.middle ?? {}) : {};
  const ctx: EvalCtx = { values: state.values, middle };
  const related = relatedFinds(ho.수량, state.one.logic.중간 ?? []);

  side.replaceChildren(
    el("h4", { text: `이 수량은 어디서 왔나 — ${ho.이름 ?? ho.요소}` }),
    el("dl", {
      className: "m01-logic__sums",
      children: [
        el("dt", { text: "지금 값" }),
        el("dd", {
          text: calc
            ? `${formatNumber(calc.수량)} ${calc.단위} · ${formatNumber(calc.금액)}원`
            : "값을 넣어야 계산됨",
        }),
        el("dt", { text: "출처" }),
        el("dd", { text: calc?.출처 ?? ho.비목 ?? "-" }),
      ],
    }),
    el("p", { text: explain(ho.수량) }),
  );

  const surcharge = related.filter((r) => r.source !== "이 줄" && r.source.includes("할증"));
  if (surcharge.length) {
    side.append(
      el("h4", { text: "적용된 할증" }),
      ...surcharge.map((r) =>
        el("p", {
          text: `${r.source} = ${middle[r.source] !== undefined ? formatNumber(middle[r.source]) : "(입력 필요)"}`,
        }),
      ),
    );
  }

  side.append(el("h4", { text: "원문 표 미리보기" }));
  const previewHost = el("div", { text: "찾는 중…" });
  side.append(previewHost);
  const previews = await Promise.all(
    related.map(async (r) => ({ r, table: await loadTable(r.find.table) })),
  );
  previewHost.replaceChildren(
    ...previews.flatMap(({ r, table }) => {
      if (!table)
        return [el("p", { className: "m01-logic__muted", text: `${r.find.table} 표 못 찾음` })];
      const hit = matchRow(table, r.find.conds, ctx);
      const cols = [...Object.keys(table.조건 ?? {}), ...Object.keys(table.값칸 ?? {})];
      const bodyRows = (table.줄 ?? []).map((line) => {
        const isHit = hit === line;
        const tr = el("tr", {
          children: cols.map((c) => el("td", { text: formatNumber(line[c]) })),
        });
        if (isHit) tr.style.cssText = "background:var(--ui-accent-bg,#fff3cd);font-weight:600;";
        return tr;
      });
      return [
        el("p", {
          className: "m01-logic__muted",
          text: `${r.source} · ${table.원문번호 ?? table.키} ${table.이름 ?? ""} (${table.출처 ?? ""})`,
        }),
        ...(table.용도
          ? [
              el("p", {
                className: "m01-logic__muted",
                text: `${tt("Use_Of")} — ${[table.용도.공종, (table.용도.대상 ?? []).join("·")].filter(Boolean).join(" · ")}`,
              }),
            ]
          : []),
        el("table", {
          className: "m01-logic__grid",
          children: [
            el("thead", {
              children: [el("tr", { children: cols.map((c) => el("th", { text: c })) })],
            }),
            el("tbody", { children: bodyRows }),
          ],
        }),
      ];
    }),
  );

  const advanced = el("details", {});
  advanced.append(el("summary", { text: "고급 — 식 그대로" }), el("pre", { text: ho.수량 }));
  side.append(advanced);
}